diff options
Diffstat (limited to 'cpu')
| -rw-r--r-- | cpu/mpc8260/commproc.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/cpu/mpc8260/commproc.c b/cpu/mpc8260/commproc.c new file mode 100644 index 0000000..dcbffc4 --- /dev/null +++ b/cpu/mpc8260/commproc.c @@ -0,0 +1,209 @@ +/* + * This file is based on "arch/ppc/8260_io/commproc.c" - here is it's + * copyright notice: + * + * General Purpose functions for the global management of the + * 8260 Communication Processor Module. + * Copyright (c) 1999 Dan Malek (dmalek@jlc.net) + * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com) + * 2.3.99 Updates + * + * In addition to the individual control of the communication + * channels, there are a few functions that globally affect the + * communication processor. + * + * Buffer descriptors must be allocated from the dual ported memory + * space. The allocator for that is here. When the communication + * process is reset, we reclaim the memory available. There is + * currently no deallocator for this memory. + */ +#include <common.h> +#include <asm/cpm_8260.h> + +/* + * because we have stack and init data in dual port ram + * we must reduce the size + */ +#undef CPM_DATAONLY_SIZE +#define CPM_DATAONLY_SIZE ((uint)(8 * 1024) - CPM_DATAONLY_BASE) + +void +m8260_cpm_reset(void) +{ + DECLARE_GLOBAL_DATA_PTR; + + volatile immap_t *immr = (immap_t *)CFG_IMMR; + volatile ulong count; + + /* Reclaim the DP memory for our use. + */ + gd->dp_alloc_base = CPM_DATAONLY_BASE; + gd->dp_alloc_top = gd->dp_alloc_base + CPM_DATAONLY_SIZE; + + /* + * Reset CPM + */ + immr->im_cpm.cp_cpcr = CPM_CR_RST; + count = 0; + do { /* Spin until command processed */ + __asm__ __volatile__ ("eieio"); + } while ((immr->im_cpm.cp_cpcr & CPM_CR_FLG) && ++count < 1000000); + +#ifdef CONFIG_HARD_I2C + *((unsigned short*)(&immr->im_dprambase[PROFF_I2C_BASE])) = 0; +#endif +} + +/* Allocate some memory from the dual ported ram. + * To help protocols with object alignment restrictions, we do that + * if they ask. + */ +uint +m8260_cpm_dpalloc(uint size, uint align) +{ + DECLARE_GLOBAL_DATA_PTR; + + volatile immap_t *immr = (immap_t *)CFG_IMMR; + uint retloc; + uint align_mask, off; + uint savebase; + + align_mask = align - 1; + savebase = gd->dp_alloc_base; + + if ((off = (gd->dp_alloc_base & align_mask)) != 0) + gd->dp_alloc_base += (align - off); + + if ((off = size & align_mask) != 0) + size += align - off; + + if ((gd->dp_alloc_base + size) >= gd->dp_alloc_top) { + gd->dp_alloc_base = savebase; + panic("m8260_cpm_dpalloc: ran out of dual port ram!"); + } + + retloc = gd->dp_alloc_base; + gd->dp_alloc_base += size; + + memset((void *)&immr->im_dprambase[retloc], 0, size); + + return(retloc); +} + +/* We also own one page of host buffer space for the allocation of + * UART "fifos" and the like. + */ +uint +m8260_cpm_hostalloc(uint size, uint align) +{ + /* the host might not even have RAM yet - just use dual port RAM */ + return (m8260_cpm_dpalloc(size, align)); +} + +/* Set a baud rate generator. This needs lots of work. There are + * eight BRGs, which can be connected to the CPM channels or output + * as clocks. The BRGs are in two different block of internal + * memory mapped space. + * The baud rate clock is the system clock divided by something. + * It was set up long ago during the initial boot phase and is + * is given to us. + * Baud rate clocks are zero-based in the driver code (as that maps + * to port numbers). Documentation uses 1-based numbering. + */ +#define BRG_INT_CLK gd->brg_clk +#define BRG_UART_CLK ((BRG_INT_CLK + 15) / 16) + +/* This function is used by UARTS, or anything else that uses a 16x + * oversampled clock. + */ +void +m8260_cpm_setbrg(uint brg, uint rate) +{ + DECLARE_GLOBAL_DATA_PTR; + + volatile immap_t *immr = (immap_t *)CFG_IMMR; + volatile uint *bp; + + /* This is good enough to get SMCs running..... + */ + if (brg < 4) { + bp = (uint *)&immr->im_brgc1; + } + else { + bp = (uint *)&immr->im_brgc5; + brg -= 4; + } + bp += brg; + *bp = (((((BRG_UART_CLK+rate-1)/rate)-1)&0xfff)<<1)|CPM_BRG_EN; +} + +/* This function is used to set high speed synchronous baud rate + * clocks. + */ +void +m8260_cpm_fastbrg(uint brg, uint rate, int div16) +{ + DECLARE_GLOBAL_DATA_PTR; + + volatile immap_t *immr = (immap_t *)CFG_IMMR; + volatile uint *bp; + + /* This is good enough to get SMCs running..... + */ + if (brg < 4) { + bp = (uint *)&immr->im_brgc1; + } + else { + bp = (uint *)&immr->im_brgc5; + brg -= 4; + } + bp += brg; + *bp = (((((BRG_INT_CLK+rate-1)/rate)-1)&0xfff)<<1)|CPM_BRG_EN; + if (div16) + *bp |= CPM_BRG_DIV16; +} + +/* This function is used to set baud rate generators using an external + * clock source and 16x oversampling. + */ + +void +m8260_cpm_extcbrg(uint brg, uint rate, uint extclk, int pinsel) +{ + volatile immap_t *immr = (immap_t *)CFG_IMMR; + volatile uint *bp; + + if (brg < 4) { + bp = (uint *)&immr->im_brgc1; + } + else { + bp = (uint *)&immr->im_brgc5; + brg -= 4; + } + bp += brg; + *bp = ((((((extclk/16)+rate-1)/rate)-1)&0xfff)<<1)|CPM_BRG_EN; + if (pinsel == 0) + *bp |= CPM_BRG_EXTC_CLK3_9; + else + *bp |= CPM_BRG_EXTC_CLK5_15; +} + +#ifdef CONFIG_POST + +void post_word_store (ulong a) +{ + volatile ulong *save_addr = + (volatile ulong *)(CFG_IMMR + CPM_POST_WORD_ADDR); + + *save_addr = a; +} + +ulong post_word_load (void) +{ + volatile ulong *save_addr = + (volatile ulong *)(CFG_IMMR + CPM_POST_WORD_ADDR); + + return *save_addr; +} + +#endif /* CONFIG_POST */ |